Molecular Weight Calculator

Enter the molecular formula, such as [(ch3)2c5h3]2FeClO4 or na cl o4
For multi-letter symbols, capitalize or separate to prevent ambiguity (Co vs. CO vs. c=o)
Common abbreviations like Me, Et, Ph work
Get the molecular weight, as well as weight % for each element

By Dave Robinson, based on code by Jared Zyskowski, using PHP, an easy to learn, open source, cross platform scripting language for the web.